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Repost from my previous writing (
http://hk.knowledge.yahoo.com/question/?qid=7007011701202).
So many good ones, depending on level. Dover published a whole volume of them, and my favourites are the Tchaikovsky Sleeping Beauty and Rachmaninoff Italian Polka. If both of you are thirsty for a challenge, then try the Ravel Rapsodie Espagnole. [Reference: Great Works for Piano Four Hands, edited by Ronald Herder, published by Dover]
Debussy's Petite Suite is quite a popular one. 6 short pieces total, very enjoyable, not too difficult. [Reference: Debussy, Petite Suite, Piano Four-hands, published by Henle]
Rachmaninoff has a suite for four hands too, and they are all very beautiful. Medium difficulty, very effective music. [Reference: Rachmaninoff, Suite Op. 11 for Piano Four-hands, published by Boosey & Hawkes]
Of course there are always the Brahms' Hungarian Dances and Grieg's Peer Gynt suite for light entertainment. These are quite easy. There are many editions of these out there.
My other favourites: Ravel La Valse [published by Durand] and a transcription of Tchaikovsky's Symphony No. 6 [Kalmus used to publish it, but no longer, so if you come across one, buy it at all cost!], and Beethoven's Op. 134 [published by Henle] - yes, Beethoven's own transcription for his own Op. 133 Grosse Fuge for string quartet (it's really difficult, and I have yet heard any performance of it; if all goes well, I'd like to be the first to perform this in HK!).